docs: def bulk_create(self, *args, **kwargs):
          """
          Overrides Django's bulk_create function to emit a post_bulk_operation signal when bulk_create
          is finished.
          """
          ret_val = super(ManagerUtilsQuerySet, self).bulk_create(*args, **kwargs)
          post_bulk_operation.send(sender=self.model, model=self.model)
          return ret_val